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That's strange, I noticed after updating KQ Minisynth to 2.0.6, the CPU usage more than doubled on my Air 1 and Mini 2. I wanted to email you earlier, but was busy.

The AUM CPU meter doesn't show which cores are active, so if the high-performance cores are off (light load), then the power-saving low-performance cores will be working harder, resulting in higher CPU metering. Once the high-performance cores kick in (by adding more plugins), the CPU meter will drop.

As far as the stuttering, does it happen when the KQ Minisynth GUI is closed?

That's strange, I noticed after updating KQ Minisynth to 2.0.6, the CPU usage more than doubled on my Air 1 and Mini 2. I wanted to email you earlier, but was busy.

I briefly compared between ver 1.8.5, 2.0.5, and 2.0.6. The CPU load made a little difference.
It is another problem. Please contact me privately.

I want to talk about iPhone XS or other devices which have A12 processor. On my iPad mini 3 and iPad Air 2, the focused issue does not appear.

The AUM CPU meter doesn't show which cores are active, so if the high-performance cores are off (light load), then the power-saving low-performance cores will be working harder, resulting in higher CPU metering. Once the high-performance cores kick in (by adding more plugins), the CPU meter will drop.

I think so, too.

> As far as the stuttering, does it happen when the KQ Minisynth GUI is closed?No.Deleted

The issue occurs when buffer size is 64 on AUM.
For example, when using Bram bos Phasemaker as a Audio Unit.
I added the above information to the main post.

On various Audio Units with AUM when buffer size is 64 and sample rate is 48k, it occurs on iPhone XS.
For example, iceGear Kronecker Synthesizer, Laplace Synthesizer.
On iPad Air 2, these Audio Units woks without a problem. But iPad mini 3 has a less performance.

Even when buffer size is 256, it stutters with a specific condition on iPhone XS, it does not on iPad mini 3.
Add KQ MiniSynth Audio Unit with Accordion patch and 20 polyphony to AUM,
add Yamaha FM Essential, and play KQ MiniSynth, then noise occurs.
And, when adding 2 more FM Essential, noise stops.
(It seems to be switched to high-performance core.)

And, I made a test app and it also stutters when polyphony increases on iPhone XS.
Sometimes it stutters with extremely low polyphony on iPhone XS.
With the same polyphony, it doesn't happen on iPad mini 3 and iPad Air 2.

@RUST( i )K Yeah, Since iOS 12.1.3, my presets stored in iCloud dissapear and re-appear occasionally. Noticed that it happens mostly with the Sugar Bytes apps, but I do use those the most. Haven't figured it out yet.

So possibly 5 Apple products may have this issue? I don't want to sound like an alarmist but all of these recent stuttering, spiking CPU issues reminds me of the unavoidable high DPC latency with many Windows laptops. Even though any Windows laptop with a quad or hex core Intel CPU may seem ideal for audio and video work, most are permanently crippled due to high DPC latency and other issues caused by the motherboard, chipset, and attached hardware and poor drivers. That's why many of the 'boutique' resellers like Xotic PC will test DPC latency and publish the results right along with the hardware specs. Audio and video pros nagged them enough.

Has anyone with an A12X (2018 iPad Pros) experienced this stuttering issue when running a 'CPU-light' synth in AUM with 64 sample buffer? The A12X has 2 additional high-performance cores versus the A12.